Chain for mining-machines.



' 0'. E. DAVIS. CHAIN FOR MINING MACHINES APPLIUATION I'ILZBD MABJO, 19,10, v

Ptenta 1m 23, 1910.

(:HABLES n. DAVIS, or cmcaco, rumors,

COMPANY, 01 CHICAGO, ILLINOIS, A QOBPOR-ATI ON OF ILLINOIS.

errant FOB mnma-macnmns.

Specification of Letters Patent.

Patented Aug. 23, 1910,

application filed March 10, 19 10. Serial No. 8,447.

To all whom it may comm:

- Be it known that'I'," CHARLES E. DAv1s, a

citizen of the United States,- residin at Chicago in the county of Cook and of Illinois, have invented a certain new and useful Improvement in Chains for Mining- Machines, of which the following is a specica c'a- This invention relates to cutter chains for minin machines, and has for its object to p'rovi e a new and improved device of this description.

The invention is illustrated in theaccompanying-drawings'wherein- Figure 1 is a plan view showing aportion of a chain embod ing the invention; Fig. 2 is a plan view one of the cutter blocks; Fig. 3 is a front view of one of the links by which the chain blocks are connected; Fig. 4 is a sectional view through the chain showing it in position in the cutter head of a mining machine; Fig. 5 is an end view of one of the'chain straps.

works in a groove.

the front of the chain groove,

- I Like numerals refer to like parts throughout the several-figures.

In the drawings I have shown a cutter chain for mining machines. This chain 'is made up of a series of chain blocks 1 pivotally connected together by a series of straps '2. The chain in use is an endless chain and passes about a sprocket wheel and This groove is (provided atthe top and bottom with gui (see Fig. 4), in which the restraining and 5 on the block and strap move. Tie blocks are provided with cutters 6, some of which in practice are inclined so as to be at .an angle, as shown in Fig. 4. When these cutters are cutting the coal, there is a strain on the chain which is taken up by the'lips 4 and 5, saidlips engaging stop pieces 7 at which stops hold the chain in place. It will be noted that some of the cutters are at one sideof the point where the chain is confined, and that these cutting points are in a plane out of the center of the chain block and therefore there are two twisting actions when the deviceis in operation, one in a vertical plane and the other in a horizontal plane. The twist in the vertical plane causes anuneven wear on the guiding and restraining lips 4 and 5, wearing them to a beveled face and making them narrower at the outer edge,

tate

that at the top and bottom. The horizontal twist causes a wear at one end of the assrenon 'ro soon'nan- Manurac'ruanm lip and also a wear on the back of the block at the opposite end. In thepresent case this wear is minimized. by movin Y the points where the stra s are connecte to the chain blocks forwar toward the point of the cutter, and by a proper arrangement and position and size of the restraining lips 4 ands).-

It will be noted that the guldmgand restraining lips are approximately evenly distributed between the blocks and the straps.

The guiding and restraining lips of the blocks are of such," length that the ends thereof project beyond the adjacent faces of the holes by which the links are connected to the blocks, that is, such lips are greater in length than the distance between, the adjacent sides of suclr holes. The lips onthe straps are beveled at 8, so as to produce inclined faces inclining towardthe ack of the chain. Thelengthof the lip 5 on the chain strap adjacent sides of the rivet holes therein. and

is lessthan the distance between the the front or working face of said. lip is back of the external face of the lugs 9 on the stra by means" of which it is connected to the lock'. The distance between the ends of the lips on the straps and the centers in the blocks, about which the straps rotate, is such that the ends of the lipson the straps never projectforwardof the front faces 10 of the lips on the chain blocks when the straps are moved about these *cnters during the operation of the device.

I have found that with this construction the chain wears very much longer than the chains ordinarily usedi". i

' It will be noted that the restraining li s 4 and 5 are back of the holes in the bloc s and straps, and that the strain and wear comes upon the front faces of these restraining lips, which areoomparatlvely small in area. It will further be noted that the front faces of the restraining lips on the blocks are substantially equal in lengthto the rear faces of the restraining lips on the straps.

I claim:

1. A chain for minin machines comprising a series of chain locks having'holes therethrough, a series of chain straps'connected with said. blocks, at the points where said holes are located, restraining lips on the chain blocks, back of said holes, the front nected with said block s, at the points where of the straps. 1

therethrough, a series ofchain stra jecting lugs on said straps which fit"-"-into the dev1ces are chain blocks back of said holes are located, the chain blocks back of faces of the. restraining. lips being longer than the"distancebetween the adjacent faces restraining of t-he holes in the blocks, and restraining lips onsaid straps beveled at the ends so as, to produce-inclined faces inclining toward the back of the chain, =ada "ted to engage the the' blocks to limit said' inclined faces ends of the lips on the backward movement 3. A chain for mining machines comprising a series of chain blocks having holes holes in the provided With received,

the lugs the straps into which fastening restraining lips onthe said holes, the front faces of the restraining lips being longer than the-distance between-the adjacent faces of the holes in the blocks, and restraining lipson said straps shorter in length 1 than the-distance-between the adjacent sides of the holes in'gthe straps.

' 4. =A -chain for mining machines comprising aseries 'of chain blocks'having-holes ectingp lugs onsaid therethrough, a' series'of chainstraps, prostraps which fit into es -in the blocks, the lugs in the stra s hic fastening ethe ho of chain straps conlips on said holes, the front ing a series of chain blocks ada said blocks togeth ps,.;pro+

' faces, and

' said strap.

chain blocks, and the length of the front faces'of the restraining lips on 'the rofor connecting it to adjacent parts, a. 1i on said bloc holes thefront ace-ofsaid 11p bemg in length than the distance between t e adjacent sides of said holes.

it. A chain for mining machines comprispted to recelve the cutters, a restraining lip'on each of said blocks, a series-of straps connecting er said straps pivotally connected with said locks, restraining lips on said straps, the distance between the adjacent ends of the restraining lips on the adjacent straps and blocks, at their working the centers aboutwhich the straps move, being substantially equal.

7. A strap for mining machine chains provided at each end with projecting lugs, said lugs having holes therethrough, a restraining lip on said strap having its working face back of the external faces of said lugs and shorter in, lenfgth than the distance between the adjacent aces of said holes, the ends of beveled so as toprovide inclined sald li U faces t ereon, inchnmg toward the back of Signed at Chicago, Illinois, this 11th day of February, 1910.

CHARLES E. DAVIS. Witnesses: p

EDNA K. REYNoLns, MINNIE M. LINDENAU. 

